past exam questions Flashcards
which fluid of oral cavity features components that promote aggregation of bacteria
saliva
neutrophils are key phagocytic cell in which oral habitat
gingival crevice
which molecules connect the outer membrane to peptidoglycan layer of gram negative bacteria?
braun’s lipoproteins
which is true of peptidoglycan?
a. peptide component is translated by ribosome
b. peptide component of peptidoglycan is linked to N-acetylmuramic acid
c. precursor for folic acid
d. bacteroprenol cleaves off D-ala-D-ala dispeptide
b
what is a property associated with normal bacterial flora of human body?
a. suppresses host immune response, making host vulnerable to infection
b. assist in nutrition of the host
c. normal flora begins to accumulate in utero
may assist in nutrition of host
which is not a property of saliva?
a. composition is similar to serum within bloodstream
b. promotes adhesion of bacteria to tooth surfaces
c. maintains pH in oral cavity
a
these are networks of polysaccharides that coat some bacterial cells
capsule
what bacterial cell structure actively propels motile bacteria in response to environmental signals
flagellum
typical bacterial genome is composed of
single, circular, double stranded DNA molecule
what molecule densely project from the surface of most gram negative bacteria
lipopolysaccharides
what refers to the life style of microbial pathogens, which involves the use of reduced, preformed organic molecules as a source of carbon
heterotrophy
which is an example of bacterial genus whose members require a complex nutrient source such as blood agar for growth in lab?
chlamydia
pseudomonas
streptocuccus
lactobacillus
streptocuccus
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